ib_umem_odp_get(9)

💅 ib_umem_odp_get(9) — like, the Kernel API Manual, section 9, bestie 🎀

okay so picture this: you're deep in the kernel, section 9 of the Kernel API Manual, and you need a umem_odp. This is the function. She's iconic, she's focused, and she's about to make a userspace va feel very seen. ✨

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🌸 NAME 🌸

ib_umem_odp_get — bestie, it literally creates a umem_odp for a userspace va. that's the whole vibe. no cap. 💖

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🦋 SYNOPSIS 🦋

struct ib_umem_odp * ib_umem_odp_get (struct ib_device *device ,
unsigned long addr , size_t size , int access , const struct
mmu_interval_notifier_ops *ops );

like… she takes five arguments and hands you back a struct ib_umem_odp *. main character energy fr fr. 👑

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💜 ARGUMENTS 💜

• device — the IB device struct you're grabbing the UMEM from. your ride-or-die context, basically. 🫶
• addr — the userspace virtual address where the region starts. the starting point of the whole saga. 📍
• size — how long the region is, i.e. how much you're pinning. length matters, we don't skimp. 📏
• access — the IB_ACCESS_xxx flags for the memory being pinned. iykyk. 🔥
• ops — the MMU interval ops. and rn? currently only invalidate. that's it. that's the list. 💀

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✨ DESCRIPTION ✨

so here's the tea ☕ — the driver should use this when the access flags indicate ODP memory. instead of pinning (which, like, who has the time), it avoids pinning entirely and stores the mm for future page fault handling, working in conjunction with MMU notifiers. it's giving "I'll deal with it later" but make it kernel-grade. no notes, honestly. 💅

lowkey important: it avoids pinning. don't come for her expecting pins, she simply does not do that. 🙈

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/infiniband/core/umem_odp.c — go read the source, it's right there 🍓
• ib_umem_odp_alloc_implicit(9)
• ib_umem_odp_alloc_child(9)
• ib_umem_odp_map_dma_and_lock(9)

the whole friend group, honestly. go say hi. 🧚

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and that's the page!! mwah 💋 — brought to you by ./drivers/infiniband/core, dated October 2026, and yeah she's literally ib_umem_odp_get(9). slay, stay hydrated, and may your page faults always be handled. ⭐💖